Rust: Use rayon and better performance

.github/workflows/ci.yml

@@ -57,9 +57,6 @@ jobs:
         echo '--- test portable'
         echo
         cargo test --release --features=portable
-        echo '--- test no-threads'
-        echo
-        cargo test --release --features=no-threads
         echo '--- test serde-secret'
         echo
         cargo test --release --features=serde-secret

bindings/rust/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "blst"
-version = "0.3.11"
+version = "0.4.0"
 authors = ["sean-sn <sean@supranational.net>"]
 edition = "2018"
 license = "Apache-2.0"
@@ -33,9 +33,6 @@ portable = []
 # Enable ADX even if the host CPU doesn't support it.
 # Binary can be executed on Broadwell+ and Ryzen+ systems.
 force-adx = []
-# Suppress multi-threading.
-# Engaged on wasm32 target architecture automatically.
-no-threads = []
 # Add support for serializing SecretKey, not suitable for production.
 serde-secret = ["serde"]
 
@@ -46,11 +43,9 @@ glob = "0.3"
 
 [dependencies]
 zeroize = { version = "^1.1", features = ["zeroize_derive"] }
+rayon = "1.8.1"
 serde = { version = "1.0.152", optional = true }
 
-[target.'cfg(not(any(target_arch="wasm32", target_os="none", target_os="unknown", target_os="uefi")))'.dependencies]
-threadpool = "^1.8.1"
-
 [dev-dependencies]
 rand = "0.8"
 rand_chacha = "0.3"

bindings/rust/build.rs

@@ -49,9 +49,6 @@ fn main() {
 
     if !target_no_std {
         println!("cargo:rustc-cfg=feature=\"std\"");
-        if target_arch.eq("wasm32") || target_os.eq("unknown") {
-            println!("cargo:rustc-cfg=feature=\"no-threads\"");
-        }
     }
     println!("cargo:rerun-if-env-changed=BLST_TEST_NO_STD");